I've been looking at eBay sellers who are advertising, for example, x100 2nd class stamps for £36 instead of £56. Are these safe to use or could customers end up getting hit for postage?
I bought a couple of grands worth of 1st class when the price jumped massively about 5 years ago (46p to 60p). Could sell what I have left for a profit now on ebay but not worth the effort.