Reddit reviews Briggs & Stratton 5431K Oil Extractor Pump, 4-Liter

Briggs & Stratton 5431K Oil Extractor Pump, 4-Liter https://www.amazon.com/dp/B009POZ9YY/ref=cm_sw_r_cp_api_i_thhECbST4B23S

I don't know what Vista charges per hour for service work but you could probably buy a few parts and tools to do most of it yourself and save some money. You could likely get most of the oil out through the fill tube using a fluid extractor like this one for $30 on Amazon.

You'd still need to get the drain plug out though cause it'd be pretty shitty to sell the bike with a stripped bolt.