I wouldnt pay that much since controls and frame+wiring can add up to over 600 big ones easily.I would see exactly what is missing and deduct that amount+100 for stuff you dont think is missing,but later will find out is.subtract that from what a complete plow is worth,my guess is around 1500 for a meyer.So i'd pay about 7-800 max if you could get everything thats missing for 6-700.Wiring and controllers cost as much as frame push plates.If you have a SD 250-why woulf you want a wimpy 7.5 meyer?Put an 8 or 8.5 on that truck,a beefy one at that.That truck is heavy and will tear up the meyer pretty fast.
pump is worth about 500.00 and blade is worth about 300.00, throw the lights in for free, and pay no more than 800.00.
The lift frame and push mounts will cost at least 500.00 much, and the controller and wireing are close to 300.00.
SO by time you are done, you will be close to 1800.00 for a total package. If I were I would buy a complete used unit, or a new system.
Dont forget the head light wiring kit.They dont give them away either.I bought a truck side kit for a western this season and it was about 300.00. MY guess is it will be about the same for a meyer. You have to add for a solenoid, relays,tap connectors,power cables, and misc connectors.