Can someone get orbera if they previously had a gastric sleeve?

Unfortunately any previous Stomach Surgery is a contraindication to getting the Gastric Balloon.
Number one, there is not enough space to fully inflate the Balloon. In addition, studies have shown that chance of complication, like Gastric Perforation, will increase with previous stomach surgery. 
These include not only history of Gastric Sleeve, but also previous Lap-Band, Gastric Bypass and even anti-reflux procedures like Nissen Fundoplication!

Hello. Unfortunately, the previous surgery on your stomach prevents you from having a balloon procedure. However, if you feel that your stomach is stretched out, and your appetite is back up, there is another non-surgical weight loss procedure you can do - the ESG procedure. This procedure can help to make the remaining stomach smaller.