Inexpensive is a relative term. What are you thinking an inexpensive price is? Do you want new or used? Where are you located? %49's are ubiquitous. Lots of cars used them. Should be able to find them on eBay, both new and used, Lucas brand and 3rd party. Then there are the UK suppliers too. Moss UK, Rimmer Bros, Brown and Gammons and others, or Brit car swap meets. There are some "Moss US" resellers who typically sell Moss parts for ~15% off Moss prices too.
_________________
Chuck.
“Any suspension will work if you don’t let it.” - Colin Chapman
Visit my ongoing MGB Rustoration log:
over HEREOr my Wankel powered Locost log :
over HEREAnd don't forget my Cushman Truckster resto Locostusa.com/forums/viewtopic.php?f=36&t=17766