For Grand Prix Models in England.
They used to carry tons of accessory bits in 1/18th scale.
Might be a good place to source a new set of wipers.Also, if Craig would be kind enough to remind us of the German diecast retailer he likes....they also carry a bunch of stuff.
I should think that with the money difference between the models, you could easily afford to get the aftermarket wipers...and still keep $$$$ in your pocket......
Good luck whichever way you decide.