THIS WEEK'S best bargain is also one of the most intriguing. Romney Sands Holiday Village in Kent (0679 63877) will not only rent you a six-berth caravan for pounds 145 for a week in June but also lays on half-nelsons instead of half-board. Though the holiday camp has some way to go before it matches Las Vegas as a big fight venue, it has a stranglehold on the local wrestling scene. Thursday night is wrestling night at Romney Sands, and more sedate entertainment is provided on other evenings.