I don't know about the UK market but the OP is in USA. Comeon guys, before suggesting that a buyer overpaid on his purchase by double, how about offering examples of where he can get one today, for 1/2 price? In the USA, this model is exceptionally rare, as one would expect from a model that was only ever released in Japan and where import costs, risks and efforts are quite high. So needless to say, it's impossible (except for lotto type chances) to find one locally. So you do what everyone else does, you look on the bay, a quick search right now of which yields........
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Of course people will come out of the woodwork now and say I'll sell you MY RX-5700 for that price, happens all the time. But where were you when a buyer was looking in the marketplace? Beauty and value is in the eye of the beholder. And it's definitely a beautiful model. We do have members here will state (and have stated) emphatically that they refuse and won't ever pay more than $200 for a boombox, M90 included. Nevertheless, M90's command a minimum of 4 figures anymore and goes up from there, regardless that you wouldn't pay more than $200, the price is what it is. Now I'm not saying one can't buy cheaper if he is patient (could be months, or years) or if he starts knocking on doors of other members, lucks out and finds an uninformed seller, etc. All I'm saying is in the open market, I want one NOW, and there's 3 choice on eBay. Price? $800 - $2000. And guess what, your 1/2 price offering isn't there. I'm just saying.....
Is there any other way to buy one? Sure. Go to Japanese auctions, try to navigate and search the site in Japanese, look at the auctions which always have 4 tiny pics and description which can't be understood, sign up for an intermediary to help you bid since you don't have a Japanese bank account, bid, pay shipping from seller to intermediary, pay big $$ (can be up to $300 for repackaging and airmail service), hope the item doesn't get cracked/shattered in the process of being shipped from seller to intermediary and then from intermediary to you, hope the item works because you couldn't understand the Japanese description, hope the item isn't covered in green island corrosion because you can't see clearly in the 4 tiny image collage, and if all else fails, after you've paid for the item, paid for shipping to intermediary, paid the intermediary a commission, paid a fee to convert USD to Japanese funds, paid the intermediary to repackage your item and ship it to you either (2-3 months sea or a week airmail), YOU CAN TRY YOUR LUCK AGAIN. Some people have great luck. Some have horrible experience. Remember, nothing about the Japanese import experience is guaranteed. But don't be fooled. That boombox you just won for $100 isn't going to be nearly $100 by the time it gets to you, with all the associated risks borne by you. Or... you can go to eBay where you have eBay buyer protection, not only on the description of the item but also that it arrives damage free. I'm just saying.....