The AK74 in 5.45x39 is a great gun, lots of fun to shoot.
The recoil is less than the AR in .223, that is why my girl friend loves to shoot my AK74s.
For low cost ammo try here. (about .11 cents per round or less)
http://www.usarmorycorps.com/index.php?page=shop.product_details&category_id=34 &flypage=flypage.tpl&product_id=65&option=com_virt uemart&Itemid=53