Plastic Record Sleeves

Hey peeps..
I am looking at getting some sleeves to protect my records.
on htfr there seems to be a polythene and PVC option...
which of these are the thick ones.. I hate those little shopping bag style covers.. also where do people generally pick these up cheap like?
ps. not sure if this is in the right place... mods feel free to move this topic and educate me... almost need a technical section..

sanity dance arena used to sell these when they were still open, not sure if there's anywhere in town ya could get them these days, maybe try bigstar records in the basement
as far as the polythene vs pvc from HTFR, had a quick look at their site, and the pvc ones look like the ones you get with picture discs or coloured vinyl and it's a hard plastic sleeve that you put the vinyl in, the polythene ones sound like the ones ya used to be able to buy from sanity, which hold the cardboard sleeve ya records normally come in
bit expensive though, i was sure ya could get packs of ten from dance arena for $$5 when they had them (Vinyl warning - $$7.95 for 10 - equipment section)
anyways, good luck with it morgs

We sell them at Central Station Marion