I asked "AE-Europe" company from Netherlands about the prices for chokes and power transformer I used in my SE 300B project, if someone is interested. Today I received the answer, and the prices are:"Centurion" power transformer with hood is Eur 58,- (~$70)
Grid chokes (amorphous "C"-core) Eur 60,- a pair (~$73)
Power supply chokes 10H 250mA 100 Ohm Eur 14,- each (~$17)
Power supply chokes 10H 150mA 140 Ohm Eur 12,- each (~$14.50)
115V (USA) is no problem. Shipping cost and delivery time (US or other countries) - best to ask direct, depends on location.
They have nice OPTs, too - but I didn`t try them yet, just the PT and chokes mentioned above - those are high-quality products with good prices, IMO.
Of course, I have no affiliation with "AE-Europe" company other then being the customer.