Thanks!
If anyone is following this thread, I did a quick search of some of the online stores I've used (in the USA). Here's what I came up with for Airfix 1/72 boats of various types (list not meant to be comprehensive, but where I would typically look):
Free Time Hobbies:
1/72 Airfix German E-Boat AIR10280 - $42.39
1/72 Airfix RAF Rescue Launch AIR5281 - $17.19
Great Models:
Vosper Motor Torpedo Boat #73 (Cat No. ARX5280) - $17.55
RAF Rescue Launch Ship (Cat. No. ARX5281) - $17.55
RNLI Lifeboat (Cat. No. ARX6280) - $22.35
RNLI Seven Class Lifeboat (Cat. No. ARX7280) - $25.55
Roll Models:
They also have the E-Boat (Cat. No. AF10280) - $41.50
Vosper MTB (Cat. No. AF5280) - $16.00
Squadron:
They have the E-Boat (Cat. No. AX10280) - $47.69
I checked Pacific Front and Sprue Brothers without success. Based on the feedback here, I think I will definitely pick up the Vosper MTB from Airfix. I'm intrigued by the E-Boat and some other Airfix subjects (rescue boats), but don't know anything about the accuracy or fit of these other kits.
Thanks to all who have responded thus far!
Cheers,
Rick