Yes, at most organised beaches in Montenegro the first one or two rows closest to the water are priced higher than rows further back. The premium can be EUR 3–8 more per set, though the exact difference varies by beach bar and operator.
This is most pronounced on well-developed town beaches like Slovenska Plaza (Budva) and on the sand stretches of Becici and Jaz, where demand for prime spots is highest. On smaller or less crowded beaches — such as Lucice near Petrovac or the pebble coves of Lustica — the tiered pricing is sometimes absent and one flat rate applies.
If front-row matters to you, arrive early or ask the attendant when you arrive whether premium rows can be reserved. Some bars hold first-row spots until mid-morning, then release them as walk-up.