You may already know these sites, but I was surfing the web for "Pleased to Meet You" and the big music online stores (Barnes and Noble, Amazon don't have it and CDNow is so expensive) so I found these sites that sell Sleeper cds, vinyl, singles, etc. Some are British so the prices are in pounds, but I thought you might like to have them for yourself or your site.

www.alternativemusic.com (CD $22.99)
www.fantasticplastic.co.uk (Promo CD £6.00/$9.00)
www.woolworths.co.uk (£15.29/$19.00)
www.xrecords.com (??)

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Vu's additions (I've bought from the following before):
www.vsmusic.com (some rare Sleeper singles are for sale)
www.cduniverse.com (Pleased to Meet You CD - $17.18)
www.buy.com (on order, Pleased to Meet You CD $17.95)
www.towerrecords.com (on order, Pleased to Meet You CD $18.99) (type in the code "SMARTSVR28" at checkout and take $10 off any order of $40, note: I have never ordered from Towerrecords.com, but I have shopped at some of their location in California.)
www.everythingenglish.com (no Sleeper items currently)
Update: www.hmv.co.uk (Pleased to Meet You CD: £ 8.49/$12.00) (thanks to Hazard)