Garmin International Map upgrade does not fit in Garmin and they don't tell you until after you purchase it!

Downloaded from Garmin's website free software upgrade for my Nuvi 1350 GPS.  Downloaded updated software and it installed successfully.

Then purchased North American (US and Canada) map upgrade for $49.95 plus tax for my Nuvi1340 GPS.  Only AFTER filling out the credit card form and paying the money, did it say that the map info is too much for the GPS and I have to purchase a memory card or stick!  This is a real disservice to customers.  I did the software update first so it knew how much memory was remaining and should tell people there is not enough memory before go through all the effort of creating an account, getting a password, and filling out the credit card info.

I even tried downloading just the U.S. portion of the maps, but the options only allow 1/4 of the U.S. (NE, SE, NW, SW)!  What a ripoff!

Also I do not understand why the new maps don't simply replace all the existing maps so there will be plenty of room

Have other people experienced this?  Is there a way to purchase a real map upgrade from another company besides Garmin that will work on a Garmin?  Is there another GPS brand that does not treat people the way Garmin does?