Not a Flip price, but it's a reasonably good deal, because based on the crummy cell phone pics, it appears to be a 77 not a 73, and so it has a cotterless crank and Raleigh branded Suntour DRs. (Many people "upgrade" earlier issues of this bike with similar components).
If it actually is a Brooks leather saddle, then this is especially worth while at $150, provided all the cosmetics and mechanicals are in order. If not negotiate - and check the tires while you are at it.
Don't let the 2030 high ten sticker fool you - The 70's GPs are nice riding all-around bikes, but they do definitely benefit greatly from alloy rims for handling and braking - so this is one investment you will want to make if you intend to keep the bike.