Budgeting is just part of the game. Cheapest I've seen PSA put a lower build kit which includes their normal/classic lpk is $80. This is not MOE gear, just plain grip and stock, but not that PTAC stuff either. If you time it right you can get free shipping too. I have never built an upper but PSA have had complete ones pretty cheap, $239 for blemished upper with FN barrel. You could always save the barrel you bought for your next build. There is always a next build.