Aircraft Spruce list this part number as the "150 Avcon Conversion" - Spruce Part Number - 05-15388 Special Order.
And this as the 150 spinner - Spruce Part Number - 05-01257 Manufacturer Part - TCB0450027-12
The pictures look identical - though that could just be Spruce using a placeholder picture.
Both $881
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If you back out the Manufacturer Part number - you end up on Textron's website:
https://ww2.txtav.com/Parts/PartSearch/PartsDetail/0450027-12--
A little more digging on the Textron Part number gets you this $505 PMA spinner:
https://www.univair.com/cessna/cessna-150-152/view-all/u0450027-12-cessna-spinner-dome/--
Most other searches on the Textron part number and you just end up at parts brokers who will get you a quote.
