The film at least (haven't really checked out the papers) only seems significantly less expensive in the rebranded Freestyle Arista brand. From B&H I just checked out 400 speed 120 to keep the options less maddening and Foma branded Foma is actually thirty cents a roll MORE than HP5+. Only the Holga branded Foma is less and that not by much (twenty cents a roll.) Single rolls of 400 speed 120 vary from a low of $3.89 for the Holga branded Foma to a high of $4.95 for Delta 400.
I'm glad they're around, because I like options and I like to play with some (Arista branded) Foma myself, but I probably wouldn't if I had to pay very nearly as much for it as for Ilford or Kodak. The Arista branded Foma 400 from Freestyle is $3.19, still a full seventy cents a roll less than even the Holga branded film from B&H and proportionately even less than the offerings from Ilford and Kodak.
Here in Germany is the cheapest film and paper brand you will find. At least is the cheapest I could find. Specially when buying the pack with 10 rools.
Foma 400 120 is 4.17 per roll and 3.53 the pack with 10 rolls.
Foma 100 120 is 3.55 per roll and 3.19 the pack with 10 rolls.
HP5 120 is 4.55 per roll and 4.25 the pack with 10 rolls.
These prices are from Fotoimpex which are the best prices I could find in germany so far. If I buy HP5 in shops around where I live the price are about 6.55 and 7.22 (some shops the proces goes even higher) por a single roll.
In Ireland I used tompey less for Ilford and Fuji films. In grrmany they are more expensive I don't know the reason.
About 4x5in sheet of film. I pay about 30 euro for a pack with 50 Foma400 and more than 40 euro for a pack of 25 HP5.
About paper, I pay as low as 15 euro for a pack of 100 Foma RC paper. It is really cheap.