Now then would you be interested in a straight swap, my Boss SYB-5 for your Polytune?
Took this is in a part of a trade, it's not my style, it is immaculate, in it's box, with poly bag and instructions, no PSU, stands me £100.00 in the trade, but to you ! A straight swap.
http://www.gak.co.uk/en/boss-syb-5/1261?gclid=COi5rrjd46sCFY4htAod1iKJOg
Bargain