If you have 3,000 – 4,000 GBP to spend you might be interested in this The Saleroom lot:

Greece.- Lear (Edward) Views in the Seven Ionian Islands, signed presentation copy from Lear to Evelyn Baring inscribed “Corfu March 1864” fly-leaf, tinted lithographed title and 20 tinted lithographed plates, plate guards, each plate with accompanying leaf of text, list of subscribers, some scattered foxing mostly in margins, bound in handsome contemporary green morocco, gilt, g.e.,by Bickers & Son London, housed in a modern slip-case, [Blackmer 987], folio, 1863.

⁂ Evelyn Baring, first Earl of Cromer (1841-1917), diplomatist and proconsul.

Or you can get Vews of Rome and Its Environs for a little less here:

Italy.- Lear (Edward) Views in Rome and its Environs, lithographed vignette title and 25 plates after Lear, tissue-guards, some occasional marginal soiling but a very good, clean copy overall, gutta percha perished with plates loose or becoming so, prospectus loosely inserted, original morocco-backed cloth, a little rubbed, [Abbey, Travel 183], folio, 1841.

Or even this, for a lousy 70-100 GBP, if you feel sure it is by Lear:

EDWARD LEAR pen & ink – small sketch of Italian village, possibly preliminary sketch for a larger work, pencil notations, 5.5 x 13cms