  We update the bounds on $R$-parity violating supersymmetry originating from
meson oscillations in the $B^0_{d/s}$ and $K^0$ systems. To this end, we
explicitly calculate all corresponding contributions from $R$-parity violating
operators at the one-loop level, thereby completing and correcting existing
calculations. We apply our results to the derivation of bounds on $R$-parity
violating couplings, based on up-to-date experimental measurements. In
addition, we consider the possibility of cancellations among flavor-changing
contributions of various origins, e.g. from multiple $R$-parity violating
couplings or $R$-parity conserving soft terms. Destructive interferences among
new-physics contributions could then open phenomenologically allowed regions,
for values of the parameters that are naively excluded when the parameters are
varied individually.
