Only 2 left be quick normaly 28 and more. https://www.amazon.co.uk/gp/offer-listing/B0013GOUH4/ref=dp_olp_used?ie=UTF8&condition=used
A very good price, but I use individual thermostatic propagators (mainly sited indoors) for most of my seed germination, and Mrs Scrungee would go ballistic if I suggested building a propagation bench in the spare bedroom.