Grellmann (1787) collected the forms Lowe, Löwe meaning ‘money’ from Continental gipsies. Lexicon Balatronicum (1811) attested Lowre. Money. as Cant.
Smart & Crofton (1875) collected Loor, v., ‘to rob, plunder, steal’ and the forms Loóvo, Lóvo, Lúva n., ‘money’ from English Gypsies. So there may have been a confusion between these two terms.
Canadian Paul Pope (2013) also cites the form lour with the same meaning.