I have the following:
Hylix carbon fibre stem, 31.8 x 100mm, 125g (would be around 110-115g with a £5 set of Ti bolts fitted). New, just with marks to the carbon at the bolt fixings. Black with white markings. £18 posted.
RC (?) alloy stem, 31.8 x 95mm, 161g. Also black with white markings. Excellent condition. £11 posted.