Have you heard of BTrendie before? BTrendie is an online store that carries Baby, Children, and Maternity items. Every few days they host a new "event" where they offer items at a reduced cost. Just by signing up here you can earn a $10 credit to be used on any item of your choice. Right now one of the events is Sunny Smart Swim Suits and the one above is only $16.99 plus $6.95 shipping, after your $10 credit only $13.61 Shipped. I love these suits that have built in UV protection and cover their shoulders. It is so nice when you are spending a whole day at the beach or pool and really want that added protection. I was worried that my kids would be hot in these, but the fabric is very breathable and light!
The also have swim separates for $13.99, so only $3.99 after the credit. You could get a swim shirt and just use it with your current swim suits or swim diapers!