Hi Phatline,
Thank you, did my best with my best English.
I checked ebay price and they are thief.
You've got 2 solutions; http://www.best-electronics-ca.com/
1 - I know the guy, his parts are original, he is in California.
He can provide the NTSC and PAL model
TIA NTSC (separated outputs) 11$50
TIA PAL 8$
But he limits the quantity by order, because it's an old and original stock. He is an historical Atari spare part provider.
2 - Psykhaze found a chinese source for the PAL model UM6520P1, he already sent me some, I tested it, and it's fine, same as original I have got.
We can try to deal it 4euro each and we are close to order 50 pieces.
Then source the chip is not a problem, just tell us how much you want. ;)
Antichambre