If it's $4,000 Canadian dollars then that translates to about $3,000 US dollars.
You need to ask for the style of frame (HQ has made several). Also, how wide is the frame? Does the machine come with a stitch regulator?
There are a couple of places online where used machines are posted. You might want to scan those to see if you can find a similar setup to see what people are asking. (Asking prices can be inflated; setups may actually sell for considerably less.) Here are a couple of websites to check:
http://www.longarmuniversity.com/MachinesForSale.html
https://www.handiquilter.com/forums/...hines-for-sale
To me, the asking price sounds reasonable. A new Sweet Sixteen runs about $5600-6000 in US dollars (without frame). A frame would be at least $1,000 more. So $3,000 for both used sounds okay. However, you can always offer less. Used setups tend to be difficult to resell and, especially if you cannot try out the machine for yourself, you may have some maintenance costs.
Edit: Not sure how you get a .32 exchange rate. I Googled Canadian dollar - US dollar conversions and got 1.31 for USD to Canadian, .76 Canadian to USD. That's how I came up with the $3,000 USD equivalent.