I have a 2003 Tacoma and I have a tonneau cover from Lund. It's the Genesis, wich is a roll-up cover with the tension bars atached to the cover, wich means that when you roull the cover up the bars will roll with the cover leaving the bed open. The fabrics of the cover are top quality, I really recommend this cover. The only thing is that you can't fit a bed linner with this cover, you would have to purchase a cargo matress instead.
The store I got this from is
http://trucktoys4less.stores.yahoo.net/index.html Excelent service and a lot of accessories for trucks, including your Tacoma.
Good luck.