Lenders have removed 78 deals from the market since the start of the July, according to Moneyfacts, leaving 1,660 products on offer.
But this is an improvement compared to the midst of the pandemic in May when there only 1,455 buy-to-let mortgages available.
In a further boost for the sector average rates have fallen for both two- and five-year fixed rates, sitting at 2.72 per cent and 3.11 per cent respectively.
However, lenders have pushed up rates for borrowers at 60 per cent loan to value (LTV) compared to March before the pandemic.
Typical two-year fixes at this level have increased from 1.89 per cent up to 2.42 per cent over this time period, while five-year deals are up from 2.31 per cent to 2.76 per cent.
Landlords at 60 per cent LTV should consider locking in rates now to protect their repayments, according to Moneyfacts spokeswoman Eleanor Williams.
She said: “Those borrowers who have a larger 40 per cent deposit or equity will find that average rates have steadily increased since July, with the average two- and five-year rates standing 0.53 per cent and 0.45 per cent higher respectively than in March; therefore, those with higher levels of equity may be wise to compare deals carefully.
“Landlords looking to invest in the BTL sector could see this as an opportune time to explore their options, especially if they think that average rates may continue the upward trajectory we have witnessed over the last two months.
“However, economically, we remain in unchartered waters, with many providers exercising caution in their underwriting, so landlords or potential investors should ensure they thoroughly research and plan ahead in order to protect their investments.
“In these ever-fluid times, seeking advice and support from independent, qualified professionals could be invaluable in navigating their choices,” she added.