The Globe and Mail reports in its Tuesday edition that just as they become more widely available, high-interest savings account ETFs are losing some of their appeal as a place to park cash. The Globe's Rob Carrick writes that TD Direct now allows clients to buy HISA ETFs, as does RBC Direct. Both on-line brokers stood out from their peers for blocking clients from buying these popular investments. However, wide availability for HISA ETFs comes as the interest rate they offer declines. Expect to get a yield of 4.9 per cent or a bit more these days, down as much as 0.4 of a percentage point from a couple of months ago. HISA ETFs hold savings deposits at big banks that offer plus-size interest rates tied to the Bank of Canada's trend-setting overnight rate. While yields in the bond market have fallen a lot lately, the overnight rate has stayed put. Rates offered by HISA ETFs have declined already because of new rules affecting the bank deposits they hold. Federal banking regulators have asked banks to treat these deposits in a way that results in a lower payout to HISA ETFs and the investors who own them. We could see more slippage in HISA ETF rates in the weeks ahead, even as the Bank of Canada stays on the sidelines.