SATA drives aren't that more expensive than there IDE counter-parts normally just a couple of pounds more here in the UK.
Heres a Lite-On one for under £24 http://www.scan.co.uk/Products/ProductInfo.asp?WebProductID=520882
Or a Samsung one for under £22 (not in stock at the minute tho) http://www.scan.co.uk/Products/ProductInfo.asp?WebProductID=368150
The ones i know about are Samsung, MSI, Lite-On and Plextor. The Samsung an Lite-On normally sell for around the £20-£25 mark and the Plextor is normally double that and more, never seen an MSI one for sale so dont know about price on that one.
Can recommend the Samsung one, mines fast, quiet and so far been reliable but its the IDE version, not used a SATA one yet.