Lots of good sales at City Beach at the moment including their Bikini Sale that has individual tops and bottoms starting for as low as $9.99 and bikini sets and one piece swimsuits for as cheap as $19.99.
I was looking at some of the Billabong Bikinis on sale and saw the Mahalo Bikini set for $45. The set has a bralette top paired with a biarritz pant. The top seems to give you medium to top coverage that is suitable for A-C cup sizes. The pants, on the other hand, give you a sort of skimpy coverage with lower front and back complete with tie sides.
I went on to the the Billabong website to see what they're charging for this bikini set and found it for around $80 - so obviously this is a better deal.
Shipping is only free if you spend at least $75 so you’ll either have to spend another $35 on their site or you could pay an extra $5.99 for standard shipping.