Finding single women can be fairly challenging. Single women are somewhat rare in the lifestyle--not as rare as the moniker "unicorn" given to them in the swing community indicates--but still pretty rare. Add to the fact that the pool of candidates is small the fact that you are only likely to "click" with about 1 in 10 of the people you meet in the lifestyle, then single women can become pretty difficult. Having said all this it does not mean that single women are impossible to get to play with you, just harder than most.
One thing you might consider is looking for couples with a husband who maybe doesn't mind watching or at least participating in a limited fashion. We had a couple contact us once where the wife wanted to try playing with a woman and wanted to watch her husband fuck another female, but didn't want to have sex with another male. They contacted us very respectfully and asked us if we would ever be willing to consider all three of us playing with my wife, but me not touching the other woman involved. After Mrs. cupl and I talked about it for awhile we decided that we would be willing to try (sounded fun and different). So we said we would be willing to meet them. After we met them we realized they were super sexy and fun, so we figured, what the hell. It turned out to be (probably) my personal favorite swing experience so far and I never even touched the other woman. So, you might try to think out of the box a little, beyond just "single females" in order to increase your possibilities. Best of luck to you both in finding the fun for which you are looking.