Made it this time!  Not looking at others' answers...  Also, I've posted my guess for what it is listed in the book, and for what I would probably charge for it, as per the rules of this game.
1) Belt of Battle - book guess:  1000g.  My price for +2 init, 1/day pounce:  3000g
2) Belt of Growth - book guess:  400g.  My price for 1/day enlarge person belt:  1000g
3) Desperation Chain - book guess:  3000g.  My price for a better-than-auto-quickened 3rd lvl spell when you need one:  9000g (still less than 1/3 of the price of a quicken rod, since uses slotted space and only works on low-level spells, but it does give you an immediate action...)
4) Healing Belt - book guess:  400g.  My price for a couple of decent spells:  1000g
5) Belt of One Mighty Blow - book guess:  400g.  My price for a 1/day +tiny damage:  750g
6) Cord of Favor - book guess:  400g.  My price for +crappy skill and 1/day sub spell:  750g
7) Belt of Ultimate Athleticism - book guess:  4000g.  My price for duplicating rogue special ability for multiple crappy skills:  6500g
8) Belt of the Wide Earth - book guess:  1500g.  My price for ok ability + sub teleport:  3000g
9) Belt of Priestly Might -  book guess:  4000g.  My price for +2 str belt and +1 nat armor ammy (wrong slot) for very few folks only:  5000g
10) Silkslick Belt - book guess:  1500g.  My price for rare-use ability + 1/day boost:  3000g