Depends on Race / Class / Level, not least in the fact that shop price is a function of Level. http://www.cardhunter.com/forum/threads/economy.685/#post-10558
Solid non-answer. Let me rephrase: What are items that are worth buying for max level characters in your opinion? It can be bang for your buck specific, or even "can't live without" epics.
Only three leap out at me when I think "must have" http://wiki.cardhuntria.com/wiki/Items/Rageblood_Dagger 100g or 50 pizza (from the starter pack). Vicious Thrust, dancing strike and blind rage are just too good to pass up. http://wiki.cardhuntria.com/wiki/Items/Frosty_Staff 100g. Encumbered is really strong right now and this item has it in spades http://wiki.cardhuntria.com/wiki/Items/Electroporter_Novice 25g. As Lance mentions, this is an excellent arcane skill due to offering 3 traits for no power tokens
Inductor and Generator stack, so having one of each isn't much worse than having two copies of Generator. The block roll reduction on arcane spells helps in unexpected places (Winds Of War). It kinda seems like making lists is like nominating cards for them to nerf, for better or worse. Commons and uncommons: Axe Of The Dark Soul. Get wrecked! I love Unholy Wellspring and Unholy Power. Wand Of Sealed Air I run a lot when I have wizards. Smoke Robe very useful item. Dueler's Buckler and Parrying Buckler. Rares: Fireblinker Initiate you wouldn't pass this up for 100g would you? St Ulrich's Bones Bless is very strong.
Some of my favorites that have not been named yet: Glimmer Boots One of the best boots for characters that don't need to make big moves. A cycle trait, decent armor and a decent move is exceptional for a common with no powertokens. Demonic Blade A great cleric weapon for combat clerics. Uncommon and takes no yellow power tokens for 2 vicious strikes, a devastating blow and two bad cycles. Trained Cleansing If your cleric is not running altruism, this divine skill is hard to pass up. Common, no power tokens and two great cards: Purge and Invigorating Touch with a decent trait. Glowing Hide Armor Common, no power tokens and one great attack card and two decent armors makes this a very nice item. Greenstone Pendant Winds Of War and Whirlwind Enemies are both fantastic and Big Zap is not all that bad. Great deal for one power token and uncommon rarity.
I bought that from Randimar last week, and I have enough free pizza left to get the starter deck too if I want. Nope, bought it earlier this week (along with Flametouched Spear and Magma Scepter; Randimar must've been having a fire sale). I got this from a random chest ages ago and haven't used it yet. And that's everything I've ever purchased from the shops. Other items I've found very useful: Blazing Shortsword, Nifty Halberd, Sharp Shell, Orb Of Flames, Frenzied Slicing, Staff Of The Inferno, Staff Of Fireballs, Weakling's Helm, Battered Holy Mail
I recently bought Focused Healer from Randimar: probably the biggest upgrade I've had. (All my builds have a priest who is a pure healer.)
Do you want OP? Wym's Lavastaff Staff Of A Million Fireballs Also, amazing wizard robes: Purple Cloak Ochre Robes
If you have finished the campaign then it is pretty easy to farm up any high level common or uncommon that you want (well, any level common or uncommon really). Just do the quests that are the appropriate level every day for a few days and you should have one.
Yeah, weird thing is that the shops seem to cap out at level 17 (aside from Randimar's, anyways); Those juicy level 18 items are drops only, and hot damn the power difference between level 18 and level 17 feels huge even just for commons and uncommons.
That's because it's a power token change: weapons go from major/minor to major/major and non-weapons go from minor to major.
Rare Frosty Staff Staff Of Winter Rod Of Winds Slippery Shield Shuddering Relic uncom Advance Flexibility Electroporter Novice Locket Of The Gale (not sure if this is avail in shops (lvl 17)) Parrying Buckler Robes Of Lightness
Locket of the Gale is not available in any shop. Level 17 and 18 commons and uncommons are not sold anywhere. Randimar's stocks rare/epic/legendary items of all levels and The Goblin Bazaar stocks level 11-16 commons and uncommons so their coverage has this gap. It makes common and uncommon level 17 and 18 items rarer in practise than they would otherwise be. They are available only as random drops and only from the highest-level adventures and multiplayer.