I am getting rid of some tweeters that I bought to try out and never got around to trying. Both are used but in very good condition.
Vifa D26NC05 1" Textile Dome Autosound Tweeter. These come with the optional (i.e. more $$) flush mount. Do a search of the forum and you will find that many regard these as some of the smoothest sounding bargain tweeters around. They come with the mounting cups that are shown in the pic. These will set you back $70 + shipping at Madisound. I am asking $40. Price includes shipping and Paypal.
Audax TM025A7 25mm dome tweeters. Made in France. Quite small because there is no flange. 1.5" diamater and 0.75" mounting depth. These would be an excellent choice if you have limited room to mount your tweeters. I'm fairly sure these are designed for autosound use because of how small they are. These go for around $70/pair new if you can find them. I am asking $50. Price includes shipping and Paypal.