In my opinion the best Bikini Trimmers on the market are the Panasonic Close Curves Electric Ladies Trimmer model number ES2216PC.
And the Schick Quattro for Women Trimstyle Razor and Bikini Trimmer which are the two bikini trimmers I have and I love them both but the Panasonic Close Curve electric Bikini Trimmer is the one I use the most and prefer.
But both of them are great trimmers for women.
Another good Bikini Trimmer that has good reviews is the Braun Silk-épil FG1100 Bikini Trimmer.
Conair makes a cheap Bikini Trimmer that is around $10.00 that you can buy at Walmart and I've used it with good results but I prefer the others.