I had the Truss case for the Playbook and it was pretty bulky; definitely a lot thicker than the OEM case for the Touchpad (and the fucking power and volume buttons didn't work on the Truss case for Playbook.
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They might be all gone now, but I know Staples was clearing the OEM TP cases for $24.97 less Manager's discount (usually 10% - 50%). I snagged a pair for $12.49/each back in September and they still had a ton.
You should check out Best Buy as they're selling the Touchpad still (bundle offer w/ HP laptops), so they might have the cases.
NCIX has it on their website and they're showing a ton in stock (all locations), so you should be able to pricematch (and they advertise an in-store pricematch) ...
NCIX.com - Buy HP TouchPad Case - HP Consumer - FB343AA#AC3 - in Canada
These guys have it for $16.99, so you should be able to get NCIX to PM them ...
Microcad.ca | HP TouchPad Carrying Case for 9.7" Tablet PC
I won't comment on the stylus as I don't use one.