Raised bed - stage 2

My raised beds are made with concrete blocks. Each block has two holes in it, which are roughly 14 × 11 cm (I measured them this morning). The idea is that they give me extra planting space around the edge of the raised bed, and they do, but I’ve talked before about the issues – namely plants that are too vigorous, sinking perennials and species which create too much of a barrier.

I have a square plastic plant pot (iirc it arrived holding Jenny, my kiwi) which is 12 cm square and 20 cm deep (volume 2 litres). It fits well in the planting holes, and I reckon if I planted all my edge plants in one of those it would solve all of the problems. If a plant got in the way or needed repotting, it would be a breeze to pull it out and replace it.

There’s only one problem – I had this idea last year and I haven’t been able to find a source for the pots. I tried again this morning and found the perfect ones at Floralive, but their website is unfinished, dated 2004 and PayPal says they’re not accepting money – which doesn’t inspire confidence. I’ve used their contact form, but I’m not expecting a response.

I’m not sure how many I need; quite a few, but less than 100. I will count at some point – but in the meantime, does anyone know where I can get my hands on some of these pots? Preferably at a price that won’t break the bank.

Thanks :)