Just so you know how they do it:
The AquaMate and RainbowMate are designed to be given away in exchange for leads. Most salespeople have no idea how to sell one or how much they sell for, as they normally give them away. Be prepared to pay $100 for a RainbowMate and about $200 for the AquaMate if you buy them.
Be prepared for at least a $100 price on the Rainjet attachment. Be prepared to spend at least $150 on the extra long hose. Most distributors sell the 4 quart pan for about $80.
Most US distributors do not carry the Rexafoamer as the sprayer is an optional attachment virtually no one buys. They would normally not carry it in stock.
Think about how much you want to put down. At least $500 would be normal for the 'Full Package" (yes, you can finance the optional parts). Your interest rate and length of financing time depend a lot upon your credit report. People with "not great" credit pay between 21 to 27 percent interest. The better your credit, the less the interest rate and the longer of a time you can finance the total for.
With tax and all the optional parts you want, expect to spend a little more than $4000 for the new SRX model (these prices are based upon a guess based upon the selling price of the black model as of August, 2019).
If you financed at $50 to $70 per month, expect the total of payments with interest and down payment to be $5000.
Personally, I'm going to wait a year and pick one up that was a repo or at the pawn shop for MUCH less than a grand. Wait 2 years, and you'll be able to get one from Facebook Marketplace for $500 or so. Of course, you'll have to buy your optional pieces brand new, since almost no one get any of them. Remember you have to give the names of your friends to the salesman to qualify to get one of them free.