You can get DPM from Mistral Industrial Chemicals (if you’re a business) or from their consumer site here @ £32.99/5L, inc VAT & free delivery to Ireland and mainland UK. TPM I’ve sourced from Woburn Chemicals. They don’t have an online store so you’ll have to email them or give them a call. I got 5L TPM from them for £52.60 inc VAT. Shipping is on top of that but I live locally so I collected it from their depot.