Your Lotus Explorer was introduced in 1987 and is not a common bicycle. We do not know if the bicycle was offered past 1987, but by then Lotus as a bicycle company seems to have been winding down their production. 1988 versions of 1987 models are not common. Lotus was known more for their road bikes and it seems their BMX models and some of their ATB models are not found very often. The first Lotus ATB was the Pegasus introduced around 1983-ish, then they added the more affordable Viking to the line by 1986. In 1987 Lotus jumped to 6 ATB models, the Pegasus, Cherokee, Viking, Explorer, Express and Commuter (listed from the top of the line to entry level).
The Explorer had a suggested price of $359.95 in 1987 and came in Crimson and Forest Green. Lotus advertised the bike as "moderately priced with true off-road designing and componentry".
The bicycle also featured 2" tires, oversized Cro/Mo tubing and 15-speed gearing.
I think $200.00 was an okay price to pay for the bike and it should suit your needs well.