Per Kymcousa.com the last year for the Spade 150i was 2020... so far. And MSRP is $3399. I wouldn't bother with any dealer that tried to sell me a bike for more than MSRP (not counting the customary upcharges they tack on).
https://kymcousa.com/motorcycles/spade-150i/Lower price than either a Grom or a Monkey from Honda.
And the MSRP for the AK 550 was $8999 in early 2021 but went up $400 due to shipping cost increases by March so a 2021 AK 550 was $9399 for most of the year. And the 2022 AK 550 MSRP is $9899.
What ever dealer you are look at for prices I'd stay away... unless you are looking for an AK 550 and then I'd make sure they honor that $8000 price you mention. That would be bargain for a 2021 and especially for a 2022 new.
If you want to see prices all over the ballpark look at Honda... from a MSRP of $1807 for the Navi up to $28,500 for the Gold Wing Tour... and everywhere in between for other models. Just sorta keeping it within the criteria you established.
Yeah, prices for all the products range all over, but remain consistent for selected models and still reasonably priced when compared with other top brands.
Kind of strange to expect the price of a 150 scooter to be anywhere close to the price of a 550 scooter. Never known that to happen yet.