Collect the blue glasses that are on the floor in the Cantina in Mos Eisley and stack them together. When you do this a bowling ball will appear which you can 'Force' throw into them to get studs.

If you want to unlock this professor of archaeology and adventurer go to the 'Bonus' area in the Cantina at Mos Eisley and then through the door which is marked 'Trailers'. Watch the trailer for 'Lego Indiana Jones' and you'll then be able to buy him for 50,000 Studs at the shop.

These characters and extras are unlocked by going to the bar in the Mos Eisley Cantina and inputting them in the Code section (these codes unlock the character or extra but you still have to buy them).

Unlock Boss Nass:
Enter the code HHY697

Unlock IG88:
Enter the code GIJ989

Unlock Jango Fett:
Enter the code KLJ897

Unlock R2-Q5 Droid:
Enter the code EVILR2

Unlock Stormtrooper:
Enter the code NBN431

Unlock Tie Interceptor:
Enter the code INT729

Unlock Vulture Droid:
Enter the code BDC866

Unlock Disguise:
Enter the code BRJ437

Unlock Force Grapple:
Enter the code CLZ738

Unlock Imperial Shuttle:
Enter the code HUT845

Unlock General Grevious:
Enter the code PMN576

Unlock Droid Tri-Fighter:
Enter the code AAB123

Unlock Captain Tarpals:
Enter the code QRN714