I bought my Flea bass 5 new for USD 2,000 back in 2007. At the time, the exchange rate was 1 GBP = 2 USD.
So, GBP 1,000 for a new modulus was a good price and certainly good value. Today, the exchange rate is 1.58.
The USD 2,300 they propose is GBP 1,446. It's a lot of money !!! I would not do it at this price, unless someone can prove me that they will become extremely rare and hold their value. Or, unless you've tried one and you are totally in love with it.