Some friendly advice: Don't drink and play as Ottomans when Sipahi are available. I did that once, and had to pass the game on to another player a turn early because I was ripping through Carthage so badly I lost track of stuff (like where the Carthaginian capitol had jumped and what I wanted to sack next... ) Most likely. Try this next time they won't sell you anything. Drop your science slider to ZERO, and see if they'll take gold-per-turn for the tech. Sometimes a little slider jiggling will free up just enough cash flow to buy a tech or a lux or something. With a tech, if you can get some of your GPT back brokering it to other civs, you might be able to take that research slider right back up.