Yeah, I see your problem.
How many miles on the scooter?
7 years ? - yeah that belt could stand to be renewed just from age - as do the tires, to be on the safe side.
It sounds like they're charging an hour shop time for the belt, and an hour for each tire replacement.
A speedy guy might do the front tire in 1/2 an hour. The rear could certainly take most of an hour.
And the belt 3/4 of an hour....without slapping through it.
If you're an experienced mechanic with scooters - you could remove both wheels and take to the shop for the tire installations. You could also do the belt replacement (and toss in some fresh rollers while you're in there and a new exhaust gasket after removing exhaust)
Your $ would be @ $18 for the rollers and $48 for the belt, + price of a pair of tires - plus the mounting fee for the tires onto your rims.
A lot of work on your part - but could get it done for maybe $225. +/-
The upside is - if you don't have a lot of miles on your scooter - you'll be good for a long time.
Really depends on your willingness to do the work - and how many miles you have on the scooter (ie. does it need valves checked, brake pads replaced, brake fluid replaced, air filter, spark plug, fluid changes - ?)
IF you have a good sound scooter - even his price would not be crazy if you plan to keeep the scooter for a long time.
These things don't re-sell for much - but the cost to replace a good running LIKE200i with another good running scooter might make these repair costs seem easier to take?
Stig