The phrase "a slightly cheaper" is correct and usable in written English.
It can be used when comparing prices or costs, indicating that one option is marginally less expensive than another.
Example: "This model is a slightly cheaper alternative to the one we initially considered."
Alternatives: "a bit less expensive" or "somewhat more affordable".
Fletcher said Ferrari may consider developing a slightly cheaper model, although still costing €100,000 plus.
A pint of Cecil's Revenge is likely to be a slightly cheaper way of raising a glass in memory.
When I called them in late October, they said they'd found a slightly cheaper apartment in Peekskill, and were starting to save money.
The farm bill, which shapes agricultural policy, should re-shape it when it isn't working, not replace a direct corn subsidy with a slightly cheaper indirect one.
There is a slightly cheaper table of costs that has been set up for O2 and Everything Everywhere as they are significantly smaller ISPs.
It is definitely one for the skincare obsessives, but for a slightly cheaper option try Shiseido's Ibuki Refining Moisturiser, £42 (from the range above), which is similarly brilliant.
Samsung majorly altered the design of their phones for the S6 and S6 Edge, turning the device from a slightly cheap-feeling plastic phone into a much higher-end metal and glass device.
Tuition in the provinces is still pretty high, coming in at an average of $5,934 and $5,470 respectively, but it's arguably better than having to pay interest on top of a slightly-cheaper tuition.The two provinces only accounted for roughly 19,000 students out of the 472,167 that borrowed money in 2012-2013, so they're not the biggest offenders in this category.
In January, Northwest began offering a second, slightly cheaper discount coach fare with a 14-day advance purchase and one-night minimum stay requirement.
Then one of them could gain by undercutting the other, that is, by offering a contract slightly cheaper than (H).
In that case one of these insurers would deviate by undercutting insurer 1, that is, by offering a contract slightly cheaper than (H_{oo}) instead.
