Good afternoon.
Exactly how much is inexpensive? And where will you buy them? That would help a lot in recommending the best offers
The products I recommend are from Newegg, if you don't live in USA, you won't be able to buy them there.
Mobo: GA-78LMT-USB3, 760GMA-P34 or ASRock 970 PRO3 R2.0 are good choices. All of them for $60, the asrock one looks better but same people have had bsod with it, if you don't mind having perhaps to rma it, that's the best one. The MSI one (the second) has only 2 slots of ram and the gigabyte one only supports ram up to 1333 MHz.
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128565
http://www.newegg.com/Product/Product.aspx?Item=N82E16813130722
http://www.newegg.com/Product/Product.aspx?Item=N82E16813157364
GPU: the most inexpensive gt 630 you can find. If you won't play any demanding game, a passive cooled one is better, as it won't make any noise. They are priced at about $55-60. If you won't play any game at all (angrybirds or plants vs zombies don't count) you can even go with a gt 610.