Have you checked on Etsy or mamazi

Depends on which part of Lagos you are in. From Victoria Island or mainland, as you follow Ozumba Mbadiwe, it will lead to Lekki toll gate. Once you cross that, turn right before the 3rd round about. That enters the Lekki Market. As you park your car (paid) and enter, there will be small grocery shops in the beginning followed by the handicrafts, etc.

After you see the KFA event center on Lekki exp way. this is after the 4 th wrong about. you take the first right turn. You will see some small shacks selling clothes and veg. cont about 50 meters and you take the first left. follow the road till the end. You can see a compound with shops and enter that compound. the shops are at the back of these shops. Just put Lekki market in your Google maps and follow the above directions. you'll get there.

Open 7-days a week from 08:00AM till about 06:30PM

Depends on the value of what you're buying. Certainly for smaller purchases bargaining in Naira may be easier and it may be hard to get change for a larger USD note. However USD can be very attractive to the vendors and they will often give a good price if they're going to get USD. Be aware that the vendor will get a much better exchange rate on the black market than you would get from a bank or hotel. So you can bargain based on a rate somewhere in between the two .. you will get more Naira value than you would have if you'd changed your $ yourself, yet they can still make some additional money back when they change it on the black market. For example, if I remember last time I was there the official rate was around 1$=299N. The black market was paying around 399N. You could pay for say N3500 worth of goods with $10 which would not have been enough if you'd changed at the hotel (into N2990) .. yet when the vendor changes it (if he does) he would get N3990 so he also wins. In reality he will probably not actually change the $10 himself as many people there are trying to get and save USD against the devaluating Naira, especially since it has just been floated. So your USD should have even more buying power at the moment.