This is probably the most active one on fb:
https://www.facebook.com/groups/1317854121980734
Also the 245 could be modified to look like a 145 if you prefer the styling of the 145.
Also try ebay, message the folk selling 145 stuff if they know of a 145 for sale. Also message the owners on here and ask them etc. I got offered one just after I bought my 142 but it was nearer the £10k mark.