Sadly, all of the places that imported it from the USA have stopped doing so, and nobody in the UK seems to be producing splenda-based jams.
Which is how I ended up buying Jon 'n Al's sugar-free jam. From New Zealand. Which, firstly, have the oldest looking website I've seen in quite some time, and secondly were being sold through Avidlite, who also have an ancient-looking website.
And when I actually bought what I wanted, it took me through a partner site (Sagepay, who seem to be part of the same Sage who do accounts packages, and were willing to let me pay by Visa, American Express, Paypal, etc.), and _then_ on to Paypal. So I got a receipt from Paypal telling me I'd paid, then from Sage, and then from Avidlite themselves. Exactly why I need three emails to let me know I successfully paid for something I do not know.
I'm sure the future was supposed to be better than this.
Original post on Dreamwidth - there are comments there.