We have a guy on here who does replacement CDI's considerably cheaper than stock replacements - you can check the thread here - https://tw200forum.com/forum/technica...di-repair.html
But first, I have to question why you think the CDI is at fault. Did you do any work to the bike before the CDI apparently failed ?
Post a picture if you can, send me a PM if you can't - (most of us can't read, not to mention the abuse the English language goes through on here)
Sorry to hear about your brother, can't be easy for either of you
Anyway - you have posted in the right place, good luck with the sale
Welcome to the board .......