You must consider they are a shop,a very good shop albeit,but they are there to make money.best place i found for a marker is www.justpaintball.com i got my marker from them and if you ring up you can find out about more stock and even get the price down
The best advice you can get will be of the people who use the stuff.
If you@re buying new there are plenty of outlets offering good deals.
LiPS,Just,Fat Bobs to name a few.
Undoubtedly the best place to buy is off of a paintball forum,usually looked after and sometimes already upped.