Unfortunetly since you do not have age verifacation you cannot view the sold items archive. That area is excellent for studying pricing. Unfortunetly since the creation of the cansoft bastard hybrid guns alot of retailers in Canada now stock only those and have eliminated their standard AEG stock. So as it currently stands there really is not much you can do in terms of researching pricing.
Your only real options are what Brit ter recommended, either read reviews or go to an event in person and ask people face to face.
"Its only a little bit on fire"