Given the LLL market at the moment, random letters seem to be 300-400 marker (I've bought 2-3 recently in that area) and useful letters that are pronouncible seem to be 600-700 (again based on sales), and words are pretty subjective but most seem to be listed for 1,000-2,000 depending. There are useful words like wet which went for 5k but seems now is not the time to sell LLLs.
There is a buyer on here who buys currency codes, I believe he owns usd, gbp and some others, maybe yen (if spelled right) would be worth more to him ?
There are 2-3 I'd be interested in there, so I'm sure others are too.