Tip to buying uncommon/rare equipment: since the price increase like twice of the gold you saved up..save up the items you get until your inventory is full. Sell those kept items and you should have enough money to purchase.
Though there are still bugs and other game related issues lurking around the dungeon. This pilot release already convinced me that this game have what it takes to be a really good TD game. The graphics are superb and the sounds are fun! You should add a fun stage where there are skeleton super man whooshing OR justin beiber (kidding) around the area.. or something like that lol. The more the updates, the more I get addicted!!!