IMHO, you are going to pay a decent price from a dealer who happens to have an amp for demo purposes. Bryston just had a price increase or will have one very soon account the stronger Canadian dollar (my guess, not a known thing...). I am not sure that a new 2B-LP has the new output devices that the SST versions have. Maybe you should e-mail Bryston to find out.
So whats a new 2B-LP worth? Over a grand Canadian, no doubt, maybe even close to $1200. So say you find a dealer with a demo and it works for you, you'll probably pay at least 80% of the MSRP if not a little more so somewhere around a grand. Remember these are not accurate figures, just a guess on my part and of cource you'll have to pay that wonderfull approx. 15% tax...
Compare this to $545 (no taxes & no shipping costs as you work right there). Large enough difference to consider!
Another possible avenue is you could offer to pay for a demo, say $50 for a weekend. Pick it up from work on Friday and return on Monday. $50 may be the possible loss you would incure if you bought it and then had to re-sell it??? This way you would know for sure and then say pay him the balance or $500 for example.
Just a few options... Remember I don't know this guy or this particular amp