The so-called "Small Set" or Hadada-repro set is now buried beneath a sand dune - so no wonder you could not find it !
Added to that the fact that locals used bits of it for fires so it is no longer complete.
Maybe in 10 years time it will slowly emerge from the other side of the dune as the dune moves slowly forwards. I'd like to be around to see that.

The main Mos Espa set still exists and although weathered, only a few bits have collapsed and it is reasonably free of dunes. There are one or two areas where the sand is building up.

Both sets are within 500m of each other. They are located quite close to Camel Rock (another popular tourist destination) used in The English Patient and as Darth Maul's landing site. Located NNE of Nefta and NW of Tozeur near the edge of Chott el Garsa (sometimes Gafsa).

West of Nefta are the Homestead Igloo and Craters and the Dune Sea.
East of Tozeur is SW Canyon and Raiders of the Lost Ark's Tanis Excavations.

All I understand now. Or I think I do. For Mos Espa they only built two sets.

But I'm still not sure where Watto's garage was filmed, in the big set or in a studio. "what do you think you are, some kind of a jedi"
And the cordinents for La Grand Dune would be nice. Or a map. But not important.

# 1 Where Qui-Gon Jinn, Padmé and Jar Jar walk into Mos Espa (among others)

This is the main Mos Espa set, located 35 km NE of Tozeur on the Chott el Gharsa.

# 2 Lar's homestead exterior.

12 km west of Nefta, on the Chott el Jerid. This one is easy to get to. Just drive out of Nefta on the road to Algeria, then when you see the small police hut (at about 8 km) on the roadside you can turn either left or right - left takes you to the edge of Chott el Jerid and then on to the Lars Homestead (exterior) location after another 4 or 5 km of offroad driving. Turning right will take you La Grande Dune, which is where the escape pod and krayt dragon skeleton were filmed during the production of ANH.

# 3 Anakin's podracer parking space.

The first time I visited it was partly collapsed, the second time I went it was mostly collapsed and what was still stanidng was partially buried under a sand dune (incidentally this is the same dune that was behind the Royal Starship's landing ramp (built onto a scaffold during Ep1 production).

# 4 Watto's garage.

If you are talking about Watto's junk shop and scrap yard this is part of the main Mos Espa set.

You've probably worked out that you pass Ank Jmel (Camel Head Rock) on the way to the Mos Espa set. And you also pass through the yardang (those funny outcrops of rock) field that Qui-Gon rode his Eopie through. The dune immediately north of these rocks is where Qui-Gon and Padme stood when they looked down on Mos Espa.

That's a good map. They copied it from my original

Sidi Bouhlel (aka Star Wars Canyon) is easy too. Drive out of Tozeur and take the route towards the road that crosses the Chott el Jerid. Right before you get onto the chott there is a turning to the left. Take this and drive 3 km. You'll see a dirt track heading off to the left at the 3km marker. Follow this right to the mouth of Sidi Bouhlel. You'll know when you are in the right place when you see the opening of the canyon and a small marabout up ont he cliffs to the left. You can walk up there to get to the TPM sand people sniper point, and then further on to the Mos Eisley Overlook cliff top.

Jeremy

Jeremy's book is long out of print - you could try eBay or Amazon.

As Colin mentioned above, Jeremy Beckett's book is out of print. I've looked for it a couple of times but never found a copy available.

The only book I know know of in print right now for the Star Wars filming locations in Tunisia is one by Mark Dermul. You can find it here:
http://stores.lulu.be/markdermul