A 18xx series can only do composite and I could be wrong with I thought the 19xx series could do composite + digital RGB (for the C128). At that point, you could use any TV that had a composite input and get the same results for far cheaper than $100. If you're trying to do standard workbench modes, you can use just about any VGA monitor (with a 23->15 pin adapter) though you'll need to use a composite monitor/tv to see what's going on to set it up. DBLPAL and DBLNTSC modes work fine on a standard 31Khz monitor and I believe Productivity does too. You could also find an older monitor with a built in TV (VGA + composite) so you could do both in 1 monitor.
