You might try the major parts suppliers. I know that Canley Classics sells a puller, but the shipping cost makes the total price pretty high. I'm not sure if Spitbits or TRF would have them, but Spitbits would be a good place to ask.
There are a number of discussions of hub pullers on this forum. Members have made them up themselves, and have had success. One search you might try is "Spitfire hub removal". Frankenstag57 made up a pretty effective looking hub puller and has posted pictures of it.
Also Spitfire & GT6 Magazine has a good link to a home-made puller at
https://www.triumphspitfire.com/puller.html
Another alternative is just to take your axle and hub to a local LBC shop. They will usually have the puller and will yank them for a (ususally low) fee.
Don't try to pull the hubs with two-arm or three-arm wheel pullers. Normally it takes many tons of pull to get these off, and at best you will bend your hub flange, rendering it useless.