I've got a ti99/4a RF box here. The official one. I built a mono a/v cable today. So like i'll ever use this thing again. Need it? take it. Don't like my price? Offer. Trades? Accepted.
Also - i've got a few extra of the 5 pin DIN ends to make these bloody video cables, so if anyone seriously wants one, i'm open to making-to-order.