That site is the official Walbro site and I use it as a resource, not for purchasing. Many times a two stroke carburetor can be rebuilt with a gasket & diaphragm kit with favorable results but sometimes not so you may want to try a kit first. I have been able to buy kits for as little as $4.00 so to me it is worth a try in some cases but mostly I replace carburetors.
As far as compression goes, I like to see 90 P.S.I. or better and more like 120. I had one in the shop today that had 60 P.S.I. and told the customer he needs to purchase a new blower and next time do not operate the engine without an air filter.
Good luck in your search